Routing based on access point name (APN) information
It is desirable for a user equipment (UE) 100 to be able to determine if connecting using an access point name (APN) would result in a home routed or local breakout (LBO) routed connection. With this information, the UE can decide which APNs to use for packet data network (PDN) connections e.g. to ensure that the bearers on the PDN connection are able to carry certain services which are incompatible with home routing or LBO routing, or to ensure that charging is carried out by the home or visited network, as desired (e.g. to avoid roaming fees). Alternatively, the user can be presented with the option of home routing or LBO routing for a connection. In order to provide this information to the UE, modified signalling is proposed, among others, by means of a method of operating a mobility management entity (MME) 200 in a mobile telecommunications network. The MME provides, S 103 , to a UE a mapping between an APN that has been or may be used by the UE to establish a connection to a PGN gateway and a routing type associated with the connection. The routing type is one of home routing and local breakout, LBO, routing. The UE is roaming in a geographical area controlled by the MME.
1. A method of operating a mobility management entity (MME) in a telecommunications network, the method comprising:
signaling, to a user equipment (UE), a mapping between an access point name (APN) that has been or may be used by the UE to establish a connection to a packet data network (PDN) gateway, and a routing type associated with the connection;
wherein the routing type is one of home routing and local breakout (LBO) routing;
wherein the UE is roaming in a geographical area controlled by the MME; and
signaling a plurality of such mappings at the same time, each mapping being for a different APN.
2. The method of claim 1 , further comprising, prior to the providing the mapping, detecting establishment of a connection between the UE and the APN.
3. The method of claim 2 , wherein the mapping is provided within a PDN connectivity accept message sent by the MME during the establishment of a connection between the UE and the APN.
4. The method of claim 1 , further comprising receiving a routing type query received from the UE, wherein the mapping is provided in response to receipt of the routing type query.
5. The method of claim 4 , wherein the routing type query indicates the APN.
6. The method of claim 1 , wherein the providing the mapping comprises sending an Attach Accept message to the UE during attachment of the UE to the MME, the Attach Accept message containing the mapping.
7. A method of operating a user equipment (UE) in a telecommunications network, the method comprising:
receiving, from a mobility management entity (MME), signaling indicating a mapping between an access point name (APN) that has been or may be used by the UE to establish a connection to a packet data network (PDN) gateway, and a routing type associated with the connection, wherein the routing type is one of home routing and local breakout (LBO) routing;
receiving signaling comprising a plurality of such mappings at the same time, each mapping being for a different APN; and
making a connection decision based on the mapping, wherein the connection decision is made based on one or more of the plurality of mappings;
wherein the UE is roaming in a geographical area controlled by the MME.
8. The method of claim 7 , wherein the connection decision comprises selecting one of the APNs for use in establishing a connection for a service.
9. The method of claim 7 , further comprising sending a routing type query to the MME.
10. The method of claim 9 , wherein the routing type query specifies the APN.
11. An apparatus configured to operate as a mobility management entity (MME) in a telecommunications network, the apparatus comprising:
processing circuitry;
memory containing instructions executable by the processing circuitry whereby the MME is operative to:
signal, to a user equipment (UE), a mapping between an access point name (APN) that has been or may be used by the UE to establish a connection to a packet data network (PDN) gateway, and a routing type associated with the connection;
wherein the routing type is one of home routing and local breakout (LBO) routing;
wherein the UE is roaming in a geographical area controlled by the MME; and
signal a plurality of such mappings at the same time, each mapping being for a different APN.
12. The apparatus of claim 11 , wherein the instructions are such that the MME is operable to:
detect establishment of a connection between the UE and the APN; and
provide the mapping in response to the detection of the connection between the UE and the APN.
13. The apparatus of claim 12 , wherein the instructions are such that the MME is operable to provide the mapping within a PDN connectivity accept message sent by the APN connection unit during the establishment of the connection between the UE and the APN.
14. The apparatus of claim 11 , wherein the instructions are such that the MME is operable to receive a routing type query from the UE, and to provide the mapping in response to receiving the routing type query.
15. The apparatus of claim 14 , wherein the instructions are such that the MME is operable to identify the APN from the routing type query.
16. The apparatus of claim 11 , wherein the instructions are such that the MME is operable to provide the mapping by sending an Attach Accept message to the UE during attachment of the UE to the MME, the Attach Accept message containing the mapping.
17. An apparatus configured to operate as a user equipment (UE) in a telecommunications network, the apparatus comprising:
a receiver configured to receive, from a mobility management entity (MME), when the UE is roaming in a geographical area controlled by the MME, signaling comprising a mapping between an access point name (APN) that has been or may be used by the UE to establish a connection to a packet data network (PDN) gateway, and a routing type associated with the connection; wherein the routing type is one of home routing and local breakout (LBO) routing;
receive signaling comprising a plurality of such mappings at the same time, each mapping being for a different APN; and
processing circuitry configured to make a connection decision based on the mapping, wherein the connection decision is made based on one or more of the plurality of mappings.
18. The apparatus of claim 17 , wherein the connection decision comprises selecting one of the APNs for use in establishing a connection for a service.
19. The apparatus of claim 17 , further comprising a sender configured to send a routing type query to the MME.
20. The apparatus of claim 19 , wherein the routing type query specifies the APN.
21. A non-transitory computer readable recording medium storing a computer program product for controlling operation of a mobility management entity (MME) in a telecommunications network, the computer program product comprising software instructions which, when run on processing circuitry of the MME, causes the MME to:
signal, to a user equipment (UE), a mapping between an access point name (APN) that has been or may be used by the UE to establish a connection to a packet data network (PDN) gateway, and a routing type associated with the connection;
wherein the routing type is one of home routing and local breakout (LBO) routing;
wherein the UE is roaming in a geographical area controlled by the MME; and
signal a plurality of such mappings at the same time, each mapping being for a different APN.
22. A non-transitory computer readable recording medium storing a computer program product for controlling a user equipment (UE) in a telecommunications network, the computer program product comprising software instructions which, when run on processing circuitry of the UE, causes the UE to:
receive, from a mobility management entity (MME), signaling comprising a mapping between an access point name (APN) that has been or may be used by the UE to establish a connection to a packet data network (PDN) gateway, and a routing type associated with the connection, wherein the routing type is one of home routing and local breakout (LBO) routing;
receive signaling comprising a plurality of such mappings at the same time, each mapping being for a different APN; and
make a connection decision based on the mapping, wherein the connection decision is made based on one or more of the plurality of mappings;
wherein the UE is roaming in a geographical area controlled by the MME.